Why do you think that? Mainstream doesn't even understand DID. There're a lot of theories. They're just beginning. How do you know in 20 years they'll know more, and have a list of different classifications of alters.

Sorry, but the common belief is that alters have personalities, each alter can take over the body, often has it's own memory. That's what I've described.

I think a major problem with humanity is biased and closed mindedness. I see this everywhere. So strange.